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Voice coil speaker

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Voice coil speaker


There is provided a voice coil speaker containing a bobbin having multilayer voice coils formed thereon in which the bobbin and a circuit board are properly arranged. In a voice coil speaker equipped with a bobbin having multilayer voice coils formed thereon and a diaphragm connected to the bobbin, the bobbin and the diaphragm being provided in a speaker body, an audio signal processing circuit board for processing an audio signal is disposed ahead of the diaphragm, and plural output terminals for outputting to the multilayer voice coils are arranged in the peripheral direction of the audio signal processing circuit board.
Related Terms: Audio Diaphragm Signal Processing Audio Signal Processing Voice Coil Circuit Board

Browse recent Clarion Co., Ltd. patents - Chuo-ku, Saitama-shi, Saitama, JP
USPTO Applicaton #: #20130022219 - Class: 381120 (USPTO) - 01/24/13 - Class 381 
Electrical Audio Signal Processing Systems And Devices > With Amplifier



Inventors: Naoki Takada, Hiroyuki Tanaka, Kenji Kono, Masayoshi Uehara

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The Patent Description & Claims data below is from USPTO Patent Application 20130022219, Voice coil speaker.

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TECHNICAL FIELD

The present invention relates to a voice coil speaker equipped with a bobbin having a multilayer voice coil formed therein, and a diaphragm connected to the bobbin.

BACKGROUND ART

A speaker (digital speaker) equipped with a bobbin having a multilayer voice coil formed therein has been hitherto proposed (see Patent Document 1, for example). In this type speaker, a circuit board for audio signal processing is connected to each voice coil through a tinsel wire, and an audio signal is output from the circuit board through the tinsel wire to each voice coil, whereby the bobbin having the voice coils formed therein is vibrated and voices are output by vibration of a diaphragm which is based on the vibration of the bobbin.

PRIOR ART DOCUMENT Patent Document

Patent Document 1: JP-A-2010-28785

SUMMARY

OF THE INVENTION Problem to be Solved by the Invention

In the speaker as described above, the multilayer voice coil is formed in the bobbin, and thus plural tinsel wires connected to the respective voice coils exist. Therefore, it is necessary to properly design the positional relationship between the bobbin and the circuit board while reflecting the structure of the speaker so as to prevent the respective tinsel wires from interfering with one another or the like.

The present invention has been implemented in view of the foregoing situation, and has an object to provide a voice coil speaker in which a bobbin and a circuit board are properly arranged in a voice coil speaker equipped with a bobbin having a multilayer voice coil formed therein.

Means of Solving the Problem

In order to attain the above object, according to the present invention, a voice coil speaker equipped with a bobbin having multilayer voice coils formed thereon and a diaphragm connected to the bobbin, the bobbin and the diaphragm being provided in a speaker body, is characterized in that a circuit board for processing an audio signal is disposed ahead of the diaphragm, and plural output terminals for outputting to the multilayer voice coils are arranged in a peripheral direction of the circuit board.

Here, in the voice coil speaker according to the present invention, the plural output terminals may be arranged so as to be spaced from one another at an equal interval in the peripheral direction of the circuit board.

In the voice coil speaker according to the present invention, the plural output terminals may be arranged on substantially the same circle so as to be spaced from one another at an equal interval.

In the voice coil speaker according to the present invention, a damper may be provided between the bobbin and a frame for supporting the circuit board, and tinsel wires may be provided so as to extend from the plural output terminals of the circuit board along the damper to the multilayer voice coils formed on the bobbin.

In the voice coil speaker according to the present invention, the tinsel wires for connecting the output terminals and the voice coils may be interwoven with the damper.

In the voice coil speaker according to the present invention, the tinsel wires may be radially interwoven with the damper.

In the voice coil speaker according to the present invention, the circuit board may be covered by a shield cover.

In the voice coil speaker according to the present invention, an amplifier circuit for amplifying an audio signal may be mounted on the circuit board.

In the voice coil speaker according to the present invention, multi-channel audio digital signals are input to the circuit board.

In the voice coil speaker according to the present invention, the band-shaped frame may be bridged ahead of the speaker body so that the circuit board is supported by the frame.

In the voice coil speaker according to the present invention, a tweeter may be disposed ahead of the circuit board.

Effect of the Invention

According to the present invention, there is provided a voice coil speaker equipped with a bobbin having a multilayer coil voice formed therein in which the bobbin and a circuit board are properly arranged.

BRIEF DESCRIPTION OF THE DRAWINGS

[FIG. 1] is a diagram showing a voice coil speaker, wherein FIG. 1(A) is a front view, and FIG. 1(B) is an A-O-B cross-sectional view of FIG. 1(A).

[FIG. 2] is an enlarged view showing a main part in FIG. 1(B).

[FIG. 3] is a diagram schematically showing a bobbin and a voice coil.

[FIG. 4] is a diagram schematically showing other examples of the bobbin and the voice coil.

MODE FOR CARRYING OUT THE INVENTION

An embodiment according to the present invention will be described hereunder with reference to the drawings.

FIG. 1 is a diagram showing a voice coil speaker 1 according to an embodiment, wherein FIG. 1(A) is a front view and FIG. 1(B) is an A-O-B cross-sectional view of FIG. 1(A). FIG. 2 is an enlarged view showing a main part in FIG. 1(B). In the figures, reference character L1 represents the center axis of the voice coil speaker 1.

The voice coil speaker 1 according to this embodiment is a speaker which is secured to the side face of a door of a vehicle and supplied with a digital audio signal from an in-vehicle mount audio to output voices on the basis of the digital audio signal.

As shown in FIG. 1, the voice coil speaker has a circular speaker opening 10 at the front surface thereof, and has a hollow cylindrical speaker frame 13 having a bottom (frame) in which a speaker body mount portion 12 corresponding to a space for accommodating a speaker body 11 is formed.

A cup-like frame rear portion 15 (FIG. 1(B)) which increases in diameter as the position thereof shifts to the front side thereof and has a circular opening at the front surface thereof is formed at the rear portion of the speaker frame 13. A magnetic circuit portion 16 (FIG. 1(B)) for driving the speaker body 11 is provided at the rear side of the frame rear portion 15.

An annular frame flat portion 17 (FIG. 1(B)) which is coaxial with the center axis L1 of the voice coil speaker 1 is formed in the speaker frame 13 so as to extend outwards from the edge of a circular opening formed at the front surface of the frame rear portion 15 along the peripheral direction of the opening. The outer periphery of the frame flat portion 17 is connected to the base end of a hollow cylindrical frame barrel portion 18 which increases in diameter as the position thereof shifts to the front side and has a circular speaker opening 10 at the front surface thereof.

A main dumper 20 is connected to the edge of the circular opening formed at the front surface of the frame rear portion 15 so as to block the opening concerned. A cylindrical bobbin 21 extending in the same axial direction as the center axis L1 of the voice coil speaker 1 is supported at the center of the main dumper 20, whereby the bobbin 21 is supported and fixed to the speaker frame 13. The main dumper 20 and the bobbin 21 are coaxially arranged so that the center axis thereof is coincident with the center axis L1 of the voice coil speaker 1.

FIG. 3 is a top view of the bobbin 21. In FIG. 3, in order to clarify the relationship between the bobbin 21 and voice coils 22, the bobbin 21 and the voice coils 22 are schematically illustrated while the shapes thereof are simplified.

As shown in FIG. 3, the bobbin 21 holds plural voice coils 22 which are formed by alignment-winding tinsel wires formed of wire rods such as copper wires or the like in the axial direction of the bobbin 21. In this embodiment, the plural voice coils 22 are provided to be stacked as a multilayer in the peripheral direction of the bobbin 21. Each voice coil 22 of each layer is connected to each tinsel wire 61 described later, and each voice coil 22 of each layer makes the bobbin vibrate on the basis of a driving signal input from the tinsel wire 61.

FIG. 4 is a side view of another example of the bobbin 21. In FIG. 4, in order to clarify the relationship between the bobbin 21 and the voice coils 22, the bobbin 21 and the voice coils 22 are schematically illustrated while the shapes thereof are simplified as in the case of FIG. 3.

As shown in FIG. 4, the bobbin 21 holds multilayer voice coils 22 formed by winding tinsel wires formed of wire rods such as copper wires or the like in a multilayer structure. In this example, plural voice coils 22 are formed to be spaced from one another every layer in the axial direction of the bobbin 21 (=the axial direction of the center axis L1 of the voice coil speaker 1). Each voice coil 22 of each layer is connected to a tinsel wire 61 described later, and each voice coil 22 of each layer formed on the bobbin 21 makes the bobbin 21 vibrate on the basis of a driving signal associated with voices to be output.

A base portion 25 (FIG. 1(B) , FIG. 2) of a conical diaphragm 24 which increases in diameter as the position thereof shifts to the front side is connected to the bobbin 21, and the outer periphery of the tip portion 26 of the diaphragm 24 is connected to the inner periphery of the speaker opening 10 formed at the front face of the frame cylinder portion 18 of the speaker frame 13. The diaphragm 24 vibrates in accordance with vibration of the bobbin 21 which is caused by the multilayer voice coils 22, and sounds are output on the basis of the vibration of the diaphragm 24.

The outer periphery of the speaker opening 10 formed at the front face of the frame cylinder portion 18 is provided with an annular frame flange 27 which extends outwards from the edge of the outer periphery along the peripheral direction of the opening, and plural screw holes 28 (FIG. 1(A) are formed in the frame flange 27. When the voice coil speaker 1 is fixed to the side surface of a door of the vehicle, the voice coil speaker 1 is fixed to the door through the screw holes 28 by screws.

Two bridges 29 and 30, that is, an upper bridge 29 and a lower bridge 30 are fixedly connected to the frame flange 27, and a disc type audio signal processing circuit board 32 (circuit board) is positioned and supported ahead of the diaphragm 24 by the two bridges 29 and 30 so that the center axis thereof is coincident with the center axis L1 of the voice coil speaker 1.

More specifically, as shown in FIG. 1, the two bridges and 30 are configured as tabular members, and the respective base end portions 33 thereof are firmly fixed to the frame flange 27 under the state that the two bridges 29 and 30 are arranged symmetrically with respect to the center axis L1. The audio signal processing circuit board 32 is fixed to the respective tip portions 34 of the bridges 29 and 30 substantially at the center of the speaker opening 10 by screws 35 (FIG. 2), whereby the audio signal processing circuit board 32 is supported and fixed to the speaker frame 13 through the two bridges 29 and 30. As described above, according to this embodiment, the audio signal processing circuit board 32 is disposed ahead of the diaphragm 24, thereby effectively and actively using a space ahead of the diaphragm 24.

Furthermore, a connector 36 to which external equipment as an output source for audio signals such as an in-vehicle mount audio device or the like is connected is provided to the base end portion 33 of the lower bridge 30. One ends 39 (FIG. 1) of plural lead lines 38 are connected to the connector 36, and these plural lead lines 38 linearly extend to the audio signal processing circuit board 32 along the back surface of the lower bridge 30 while fixed in close contact with the back surface of the lower bridge 30. The plural lead lines 38 are connected to the audio signal processing circuit board 32 through a circuit connection connector 41 (FIG. 2) at the other end 40 (FIG. 2). As described above, the lead lines 38 are disposed on the back surface of the lower bridge 30. Therefore, the lead lines 38 are not exposed to enhance the exterior appearance, and also the contact to the lead wires 38 can be prevented at maximum.

Still furthermore, the connector 36 is a member to which the external equipment is connected, and thus it is provided to the outer edge portion of the voice coil speaker 1 in consideration of easiness of the connection to the external equipment. In this embodiment, the connector 36 is provided in the neighborhood of the base end portion 33 of the lower bridge 30, and the lead lines 38 interposed between the connector 36 and the audio signal processing circuit board 32 are configured to extend linearly by using the lower bridge 30 as a member indispensable to support the audio signal processing circuit board 32. Therefore, the length of the lead lines 38 can be shortened, and flexure, etc. of the lead lines 38 can be prevented.

The bridges 29 and 30 are members having the same function as the speaker frame 13 which fixes the audio signal processing circuit board 32, and they are conceptually contained in the speaker frame 13.

In the bridges 29 and 30, a tip portion 47 of a sub damper 45 (damper) is connected to the position corresponding to a circuit fixing portion 43 (FIG. 2) as a site to which the audio signal processing circuit board 32 is connected by screws. As shown in FIG. 1(B) and FIG. 2, the sub damper 45 is a conical member which increases in diameter as the position thereof shifts to the front side. The base end portion 46 is connected to the bobbin 21, and the tip portion 47 is connected to the bridges 29 and 30 which supports the audio signal processing circuit board 32. The sub damper 45 fixes the bobbin 21 to the speaker frame 13 through the bridges 29, 30, and also properly keeps the positions of the respective members of the bobbin 21, the audio signal processing circuit board 32 and a tweeter 50 (described later) so that these members are arranged on the same axis.

The tweeter 50 is provided at the front side of the audio signal processing circuit board 32. The tweeter is a speaker for outputting sounds having strong directivity and a high sound range, and it has a yoke 51 (FIG. 2), a magnet mounted in the yoke 51, a bobbin loosely-inserted in a magnetic gap formed between the yoke 51 and the magnet, a voice coil wound around the bobbin, a diaphragm connected to the bobbin, etc. In this embodiment, as shown in FIG. 2, the tweeter 50 is firmly fixed to the audio signal processing circuit board 32 by screws 53, and also a terminal 54 extending rearwards from the tweeter 50 is directly inserted in a through hole of the audio signal processing circuit board 32 and soldered to be conducted to the audio signal processing circuit board 32. Accordingly, the physical and electrical connection can be easily and surely performed. A driving signal is input from the audio signal processing circuit board 32 through the terminal 54 to the voice coil to vibrate the diaphragm, whereby the tweeter 50 outputs sounds.

A box-shaped front shield cover 56 covering the tweeter 50 is provided to the front side of the audio signal processing circuit board 32, whereby the tweeter 50 and the respective circuits mounted on the front face of the audio signal processing circuit board 32 are protected. A cut-out 57 for properly outputting sounds from the tweeter 50 is formed substantially at the center of the front face of the front shield cover 56.



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Key IP Translations - Patent Translations


stats Patent Info
Application #
US 20130022219 A1
Publish Date
01/24/2013
Document #
13637728
File Date
02/14/2011
USPTO Class
381120
Other USPTO Classes
381400
International Class
/
Drawings
5


Audio
Diaphragm
Signal Processing
Audio Signal Processing
Voice Coil
Circuit Board


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